nelson



C. A. NELSON.

HOD BENDING MACHINE.

APPLICATION FILED FEB. 7, 1919.

L319,608n Patented Oct. 21,1919.

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C. A. NELSON.

ROD BENDING MACHINE.

. APPLICATION FILED FEB. 7. WM). lifiwfififiw Patental m. 21,1919.

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- CLYDE A. NELSON, OF GRISTOBAL, CANAL ZONE.

non-immune MACHINE.

' Specification of Letters Patent.

Patented Oct. 21, 1919.

Application fi1ed February 7, 1919. SerialNo. 275,638.

To all whom it may concern:

Be it known that I, CLYDE A. Nelson, a citizen of the United States, and a resident of Cristobal, Canal Zone, have invented a ne'w'and Improved Rod-Bending Machine, of which the following is a full, clear, and exact description.

This invention relates to rod bending Ullt chines and has for an object the provision of an improved and simplified construction 'hich will quickly and accurately bend a straight rod into the desired shape in one operation; v

Anotherobject of the invention is to provide a rod'lbending machine formed with bending jaws "and a thrust member formed with means for varying the direction oti-ts thrust as the jaws move from one position to another. i

A still further object more specifically is the provision of an" improved bending device for bending concrete reinforcing rods into various shapes, the structure being such that the bending jaws and associated parts thereof may be adjusted for different shapes and different sizes Without varying the actionof the thrust means operating on the .jaws. V

In the accompanying drawings:

Figure 1 is a topplan view of a bending machine disclosing an embodiment of the invention 7 Fig. 2 is a section through Fig. 1 on line 2-2.

Referring tothe accompanying drawings by numerals, 1' indicates a foundation of any kind, as for, instance a wood platfonm. This foundation is preferably provided with "a metal plate 2 to which a substantially Z-shaped bar 3 is secured by suitable bolts 4. One part, of the bar 3 is provided with a row of apertures 5 for receiving the bolts 6 and 7, which bolts extend through bracing members 8 and 9. A bolt 10 also passes through one of the apertures 5 and through the connecting member 11, said connecting member being bolted or other wise rigidly secured to the power cylinder 12. A brace 13 is positioned so that the bolt 10 will pass therethrough and accommodate at the opposite end a bolt 14. A cylinder 12 may be supported by any desired means, as for instance by the heads 15 of suitable bolts as shown in Fig. 2, said bolts being threaded into the lower part of the cylinder. This cylinder is operated by compressed air or steam passing through the flexible pipe 16, said pipe having a suitable control valve 17 which operates to alternately turn oil air or steam from the cylinder 12 and to exhaust said air or steam, and a valve 18 is provided in the supply pipe 19 for permanently turning on or off the air or steam supply. hen it is desired to opcrate the cylinder the valve 18 is turned in one direction whereupon steam or air will pass into the cylinder and move the piston 20. The steam or air remains turned on until valve 18 is closed and valve 17 opened, whereupon the steam. or air from pipe 19 is turned off and the cylinder is allowed to ex hau-st through valve 17 into the air.

From F 2 it willbe seen that the piston 20 is provided with a piston rod 21 and with a spring 252 which surrounds the piston rod 21 and bearing at one end against the 7 end 23 of the extension 24: secured to cylinder 12, while at the other end it bears against piston 20 so as to urge the piston continually to the position shown in Fig. 2. This eliminates the use of coniiplioatcd valve mechanism, as the air pressure moves the piston in one direction and the spring in the opposite direction. j

An endfitting 2-5 is rigidly secured in any suitable manner to the piston rod 21 said end fitting having cars 26 through which the bolt 27 passes, said bolta'lso passing through the clevis 28 which is formed with cars 29 carrying pin 30. Powerrods 31 and SQeXtend into the clevis 28 and accommodate the pin 30, whereby said rods are connected to the clevis and receive power from the piston therothrough. The opposite ends of the power rods 31 and 32, to that engaged by the pin 30 are connected to the jaws 33 and 3 1, said connection being through theextending ears 35 and 36 of reinforcements 37 and 38. Suitable bolts 39 and 40 extend through cars 35 and 36 and also through the rods 31 and 32 for pivotally connecting said rods, whereby whenever said rods are moved they will move the jaws 33 and 31 either to an open or closed position and will act substantially in a direct line on the jaws so that the direction of power will be shifted with the shifting position of the jaws. These jaws may be made of different shapes, as for instance as'right angle structures haw ing eyelets all for accommodating the pins 42 and 43, said ins also assinm through the bracing inc-mere 8 and 9 through plates 44 and 45. Plate 45 is provided with a row of apertures 46 while plate 44 is provided with several apertures 47. Itwill, of course, be evident that plate 45 could be of any desired length and provided with any desired number of apertures so as to spread the eyelets 41 ofthe jawsas far apart as desired. As shown in the drawing the jaws are positioned as close together as their construction will permit, and are arranged to bend one or more straight rods 49 into substantially a U-shaped structure as shown in dotted lines in Fig.1. If desired the plate 45 n1ay be provided withanumber of apertures 49 for accommodating the pin 50 which is preferably arranged opposite the center of plate-44 when the parts are in working position. This pin assists in supporting the rod 48 against the pins 51 and 52 as indicated inFig. 2'. The pins 51 and 52 are preferably comparatively heavy, as they are what may be termed'bending pins, the rods 48 engaging them during the bending operation. These pins are mounted in suitable apertures and any desired distance apart. It is, of course, evident that these pins must be set in proper relationship to the d1stance apart that the remaining part-of the mechanism is adjusted for, as for instance the distance apart of the jaws 33 and 34. In providing reinforcements for concrete U-shaped reinforcing bars are necessary in some instances, and by the arrangement shown in Fig. 1 one or a number of straight bars may be quickly bent centrally or at any point along their length so as to produce a U-shaped structure. This may be done without in any way afi'ecting the threads or splicing structure at the ends of the'bars.

What I claim is:

1. A rod bending machine comprising a supporting plate having a plurality of apertures, a plurality of holding pins for rods, said pins acting as abutments when a rod is being bent, a pair of jaws, means for pivotally connecting said jaws together, adjustable means for holding the pivoted end of said jaws in any given position, and a power 7 Copies of this patent may be obtained for member acting substantially centrally of each of said jaws and arranged for moving the same so as to bend part of said rod around said pins. 7

'2. A'rod bending machine comprising a plate provided with a plurality of apertures,

a plurality of pins acting as bending anvils, there being a less number of pins than apertures whereby the pins may be adjusted different distances apart, a pair of jaws for bending a rod around said pins, means for connecting said jaws together and adjustably arranged to hold the pivoted ends of: said jaws in a given posit1on,'said means permitting said jaws to move pivotally, a bracing rod for each of said rods connected with the pivoted end of the jaws, a power rod connected substantially centrally of each of said jaws, and a single power, member connected to both of'said power rods at the ends oppositethe jaws, said power member acting along a line toward and from a central line drawn between saidjaws.

3. A rod bending device comprising a plurality of pins acting as anvils, a plate formed withmeans for receiving said pins at difierent places so that a rod may be'bent with the bends at atny desired distance apart, a pair of bending jaws coacting with said pins, said jaws being adjustable toward and fromeach' other, means for pivotally mounting said jaws on said plate, and power means connected to each of said jaws for swinging the same on their pivotal points, said swinging action causing the rod to be bent to be pressed around the respective pins simultaneously.

4. A. rod bending machine comprising stops around which a rod is to be bent, a pair of pivotally mounted jaws for bending said rod, a' power rod connected to each of said jaws for operating same, a single power member for operating said rods simultaneously, means for pivotally mounting said power member on a central line between said jaws, and a pairof bracing members engaging said jaws for bracing one end thereof.

CLYDE A. NELSON.

five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

